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"""Specialization of fontTools.misc.visitor to work with TTFont."""
from fontTools.misc.visitor import Visitor
from fontTools.ttLib import TTFont
class TTVisitor(Visitor):
def visitAttr(self, obj, attr, value, *args, **kwargs):
if isinstance(value, TTFont):
return False
super().visitAttr(obj, attr, value, *args, **kwargs)
def visit(self, obj, *args, **kwargs):
if hasattr(obj, "ensureDecompiled"):
obj.ensureDecompiled(recurse=False)
super().visit(obj, *args, **kwargs)
@TTVisitor.register(TTFont)
def visit(visitor, font, *args, **kwargs):
# Some objects have links back to TTFont; even though we
# have a check in visitAttr to stop them from recursing
# onto TTFont, sometimes they still do, for example when
# someone overrides visitAttr.
if hasattr(visitor, "font"):
return False
visitor.font = font
for tag in font.keys():
visitor.visit(font[tag], *args, **kwargs)
del visitor.font
return False
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